Reflector



P. S. BAILEY Aug. 5 1924.

REFLECTOR Filed Feb. 2, 1921 3 Sheets-Sheet 1:

Invemtor 1 peficg 5 Emmy,

fi m 4 y H 4 i5,

Aug. 5, 924. 1,504,017

' P. s. BAILEY REFLECTOR Filed Feb. 2, 1921 3 Sheets-Sheet 2 LM'LLULLLLLLLLLLLMLM- Inventor: r arcg SBaHey,

Hm- Attorney.

PatentedgAug. 5, 1924.

PERCYS. rarnnyfor ama, mss'ncnosar'rs, Asst anon mo amines;

- QC OMP A KY, A. CORPORA'IION F YORK.

, niarnnc'roa. U

Application filed February 2,1921. s m no. 441,941.

To all iclwmitmayconcem:

Be it known that I,Pmzcr SL1BAinar,.

a. citizen of the United States, residingat Lynn, in the county ofEssex, State of Y5 Massachusetts, havefinvented certain new and usefulImprovements inReflectors, "of which the following is a. specification.

My invention has'referen'ce to improvements inrefiectors designed togive a widely spreadingnarrow beam,or a so-called sheet light, that is,a beam which is narrow in one plane and wide inthe planeat right anglesto'the same.

' uch reflectors ma be employed for il- 1 laminating signs, an the like,where it is desired to keepthe adjacent z'onein dark-V ness. Orthe maybe used to illuminate .tions infcontact. By reason of the'fact that theground without projectin laring rays upwardly, suchas in landing e dsforavia-I sections, while in contactat their middley'm tors, or inautomobile headlight s.

I. accomplish this result by providing a novel reflector having a;number of adjacent gambolic surfaces extending I irection to project anarrow bunch of parallel rgysin one direction, andthese surfaces arelaterally soarranged as to produce a widely spreading beam 'in the general direction at right angles to the parallel ravs. a Y lily-inventionwill be better understood from the following description taken ine0nnection with the accompanying drawings, and its scope will be pointedout inthe appended claims V In the drawings, Fig. 1 is a perspectivevie'wof my reflector; Fi s. 2, 3 and 4 illustrate several steps in t emanufacturebf my reflector; Fig. 5 is a section taken-on the line (1-0of Fig. 1 with reflected rays of light illustrated; and Fig. 6 is a viewsimilar to Fig. 5 taken "on the line bb ofFi.1..' Re arring to thedrawings, a surface ,of revolution such as a paraboloid 10 is cut into anumber of zones or sections '11 on-j lines parallel to the axisasindicated in Fig. 2. These sections are-shown asof equal width,although their widths may vary. Preferably an .odd number of 'S00-'tions are cut and the even numbered or inone general terstitial sectionsremoved, as shown in Fig. i

3; however the odd n m ered sections could be remove if desired. The'remain1ng sections 11 are arranged parallel on a curved -form whosecurvature is selected-with theview of obtaining from the reflector thede sired lateral spread of light; the curvature may be circular,elliptical or parabolic The.

curved form may be a simple circular hoop;

of suitable diameter. Ifdo not limit myself 'od to any particular numberof sections since v this number is determined'by thewidth of r': thesections and by the articular-cross. tional curvature adop a .Theparabolic. sections are assembled sideby side-on the hoopor' other formlike the staves of. a barrel, with their middle poionly the alternatesectio'nsare used, these or equatorial points 'willoverlap. at all otherpoints oftheir meridional len h, the; amount/oi overlapping increasingthe middle points to the ends. Inaddition thereto, each sectionfollowing the central f5 section on each side will appear as stepped''down fromthe preceding section.. In order to rectify the overlaps,which could'not betolerated, the sides of the sections, and preferablythe sides not facing the central sec tion, are trimmed of, as indicatedat 12. in 1 Fig. 4, so that each section will fit the next ad acentsection without overlap. In this; condition the sections will, ofcourse, still he stepped from eachother, and the gaps 86 are filled outby well fitting ledges 13, in

'dicated in section in Fig. 6, and by dotted lines in Fig. 1.

- In practice molds or patterns of the parabolic sections are primarilymadeof 90 stitfunyielding material, preferably of wood, and when trimmedfor correction of overlap the sections are glued together and the wellfittin ledges are also lued in their places. tained from which-anynumber of reflectors may be obtained bycasting or electro-deposition. Inthe completed reflector the ledges 13 are of the same reflecting mate-'rial asthaparajwolic sections and the efie'ct 100 this manner a mo d isobof these ledges is enerally the same as that shown in Fig. lasvertical.v In accordance of the surfaces the sections. Afterthe sections11 have been united in the manner described the' reflector is providedwith a. flange 14;, for convenience in mounting.

A source of light indicatedby the nu meral 15 is paraboloid the contourof the paraboloid is indicated by. the broken line 16, in Figs.

5 andn6. As I have hereinbeforepointed out, the alternate parabolicsections 11 are arranged parallel, in which positions they occupy lanesparallel to the planes of their origin positions, and form parabolicsurfaces .in .one general direction, which is with well known lawsgovernin reflection from parabolic surfaces, rays 0 light 'PI'O. ceedingfrom the focus 15 are reflected from these surfaces parallel to the axisof the paraboloid in this general direction. It has i not been deemednecessary to indicate these arallel rays. Inthe general direction whichis at right angles to the general direction just described, thereflecting surface is form'ed'of the parabolicsurfaces of the sections11' arranged as a polygon inscribed in a or circumscribed over apredetermined curve 5 and 6.

', cations thereof will 'ing beam is obtained other than a parabola;Cross-sectional views of this surface areshown in Figs.

In accordance with well known laws, all rays incident upon the polygonalsurfaces are more or less equatorially reflected convcrgently toward theaxis and diver s after crossing the axis. This is illustrated by the Iincident rays 17'and reflected rays'18. It

will therefore be seenthat in one general direction a narrow beam ofparallelrays is obtained and in. the neral direction at right anglesthereto a wide, latera y, spreadvWhile I have described nay-invention asembodied in concrete form'in accordance with the provisions of thePatent Statutes, it should be understood that I do not limit myinvention thereto, since various modifi those skilled in the art withoutdeparting from the spirit of my invention, the scope of which is setforth in the annexed claims.

What I claim as new and desire to secure by Letters Patent of-th'eUnited States, 1s:-

1. A reflector having a refiectingsurface comprising a series ofalternate sectlon's cut from one paraboloidon lines parallel to themajor axis of the paraboloid and arranged side by side polygonally abouta predetermined curvature. I 2. A reflector having a rc'flectihg sur-.face comprising a series of. alternate sections cut from one paraboloidon lines parallel to I the major axis ofthe paraboloid, said secplacedin the focus of the.

suggest themselves to between the 1 sectheir focal points displaced andnon-coinoident. 4. A reflector formed of a series of superimposednoncontiguoussections cut from majoraxes of said sections located in acomone particular surface of revolution, the

mon plane, said sections in contact along a v curve formed-by the'intersection of said plane and said sections the cut edges all lyinginparallel planes.

5. A reflector constructed with zones from a particular surface ofrevolution which 15 cut, by a series of planes-all parallel to a planethrough the majoraxis of said surface,

into 'said zones and alternate interstitial areas and which zonesremainafter the in terstitial areas areremoved,-said remaini zones drawntogether to reduce the interstifialpgaps V V a cut, by a seriesofplanesall. parallel tea lane through the major. axis of said; surace, intosaidzonesand alternate intersth tial areas andwhieh zones remain 'afterthe6. A reflector z'one slfroni a particular surface of revolutionjwh1ch 1sinterstitial "areas are removed, said nemain- P lel relation of theplanes through .tho cu edges of said remaining zones. y

7. A reflector constructed with zones from.

a particular surface of revolution which is cut, by a seriesof-planesall parallel toa plane through the-major ans of said antzones; drawntogether'tb reducez'thc 1 I terstitial gaps while maintaininglthe" mt 10" face, into said zones and alternate iiitersti:

tial areas and'which'zones remain-after, the interstitial areas areremoved, said ing zones drawn together toreduoe the interstitial gapswhile maintaining "the" parallel relation of the planes "throughthe'cut. edges of said remaining zones and surfaces. com.

necting 'the-adjacent'cut edges of adjacent zones.

8. A reflector constructed with'zones from a particular surface ofrevolution whichis cut, by a series of planes all parallel to a;

lane-through the major axis of said surface Into said zones andalternate interstitia areas, and which zones remain after theinterstitial areas are removed, said zones in contact along the, curveformed by the inter-- section with the said zones of I. plane throughthe said major axis which lane-lies per-pen dicular to said lastmentioned 9. A reflector constructed tones from a particular surface ofwhich is cut ,byaseriesofplanesallpuralleltoa' lane through the majoraxis of said' sursaid zones of a plane through the said major ace, intosaid zones and alternate interstiaxis which plane lies perpendicular tosaid tial areas and which zones remain after the last mentioned plane.interstitial areas-are removed, said reniain- In witness whereof, l havehereunto set 5 ing zones drawn together to reduce the intermy hand this29th day of January, 1921.

stitial gaps, said zones in contact along a curve formed by theintersection with the a PERCY S. BAILEY.

